312 FIRST YEAR COURSE IN GENERAL SCIENCE 



Nutrition, 54 



of animals, 255, 257, 306 

 of plants, 255, 257, 274 



Oceans, composition, 195 



currents, 197 



depth, 195 



first, 195 



life, 199 



relation .to land, 190, 191 * 



temperatures, 196* 



tides, 198 * 



Opaque substance, 122 

 Ores, 168 



reduction, 168 

 Organic matter, 55, 254 

 Organisms, 54 



complex, 289 



simple, 289 * 



Organs of locomotion, 295 * 

 Orion, 15, 21 

 Osmosis, 95, 302 

 Ovary, 277 * 

 Ovules, 277 

 Oxidation, 139 



relation to life, 141 



waste products, 257 

 Oxides, definition, 139 



mercuric, 139 



sulphur, 152 



two most important, 159 

 Oxygen, 147 



burning wire in, 147 * 



oxyhydrogen lamp, 147 * 



Pea seedling, 280 * 

 Pen filler, 103 * 



Period of revolution, of the earth, 

 34 



of the moon, 38 



of the planets, 34 

 Period of rotation, of the earth, 23 



of the moon, 38 

 Petals, 276, 277 * 

 Petrifactions, 174 

 Petrified forest, 175 * 

 Phosphorus, 151 

 Photography, 162 

 Physical changes, 48, 138 

 Pistil, 276 



Pith ball, electrified, 128, 129 * 

 Planets, 33 



Planets, brightness, 36 



distance, 35 *, 36 



motion, 33 



revolution, 34 



size, 36 

 Plants, digestion, 272 



excretion, 273 



flowerless, 280 



growth movements, 281 



importance of chemical work, 

 271 



influence of contact, 285 



influence, of gravity, 284 



influence of light, 282, 283 



influence, of water, 285 



internal cause of movement, 286 



motor organs, 283 



need of food, 257, 259 



need of water, 259 



nutrition, 255, 257, 274 



presence of water in, 269 



properties, 254 



proteid making, 270 



relation to animals, 260 



respiration, 273 



starch making, 269 



storage of food, 272 

 Plaster of Paris, 174 

 Platinum, 155 

 Pleiades, 15 

 Poisons, 165 

 Pole Star, 16, 20 

 Pollen, 277 

 Pollination, 277 * 

 Potato grown in a cellar, 283 * 

 Pressure in liquids, 87 *, 88 *, 89 * 

 Pressure of the air, 95 



differences, 96 *, 98 



direction, 100 



on our bodies, 98 

 Prime meridian, 29 

 Prisms, 123, 124* 

 Properties, of all matter, 48 



of living matter, 54 



physiological, 254 



special, 53 



Property, definition, 48 

 Proteid making, 270 

 Protoplasm, 258 



behavior, 258 



composition, 258 



sensitiveness to light, 282 



